21001251404024 has 32 divisors (see below), whose sum is σ = 39536260046400. Its totient is φ = 10458328763520.

The previous prime is 21001251403933. The next prime is 21001251404051. The reversal of 21001251404024 is 42040415210012.

It is a junction number, because it is equal to n+sod(n) for n = 21001251403984 and 21001251404002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2902544 + ... + 7101215.

It is an arithmetic number, because the mean of its divisors is an integer number (1235508126450).

Almost surely, 2^{21001251404024} is an apocalyptic number.

It is an amenable number.

21001251404024 is a deficient number, since it is larger than the sum of its proper divisors (18535008642376).

21001251404024 is a wasteful number, since it uses less digits than its factorization.

21001251404024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10004823 (or 10004819 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 26.

Adding to 21001251404024 its reverse (42040415210012), we get a palindrome (63041666614036).

The spelling of 21001251404024 in words is "twenty-one trillion, one billion, two hundred fifty-one million, four hundred four thousand, twenty-four".